From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41888) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a8RWl-0007ro-Sw for qemu-devel@nongnu.org; Mon, 14 Dec 2015 06:42:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a8RWg-0002KK-VL for qemu-devel@nongnu.org; Mon, 14 Dec 2015 06:42:51 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:17958) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a8RWg-0002Iz-Qy for qemu-devel@nongnu.org; Mon, 14 Dec 2015 06:42:46 -0500 Message-ID: <1450093294.16856.46.camel@citrix.com> From: Ian Campbell Date: Mon, 14 Dec 2015 11:41:34 +0000 In-Reply-To: References: <56548BD202000078000B881F@prv-mh.provo.novell.com> <56548D8402000078000B8840@prv-mh.provo.novell.com> <5665921202000078000BCA2A@prv-mh.provo.novell.com> <5665B56E02000078000BCB52@prv-mh.provo.novell.com> <566AF76502000078000BEB76@prv-mh.provo.novell.com> <1449852961.30975.71.camel@citrix.com> Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] [Xen-devel] [PATCH RFC v2 4/4] xen/MSI: re-expose masking capability List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefano Stabellini Cc: xen-devel , qemu-devel@nongnu.org, Jan Beulich On Mon, 2015-12-14 at 11:19 +0000, Stefano Stabellini wrote: > On Fri, 11 Dec 2015, Ian Campbell wrote: > > On Fri, 2015-12-11 at 16:44 +0000, Stefano Stabellini wrote: > > > =C2=A0 > > > It is not possible to do this at runtime. I think we should do this > > > at > > > compile time because in any case it is not supported to run a QEMU > > > built > > > for a given Xen version on a different Xen version. > >=20 > > I am currently working pretty hard to make this possible in the future, > > it > > would be a shame to add another reason it wasn't possible at this > > stage. > >=20 > > I proposed (in <1445442435.9563.184.camel@citrix.com>) that as well as > > the > > various stable libraries extracted from libxenctrl we will probably > > also > > want to have a libxendevicemodel.so at some point, to provide a stable > > way > > to interface with all the stuff which being a DM involves. >=20 > I understand the direction we are heading toward, but unfortunately we > are still pretty far from it. I don't think we want to block this patch > until we have a stable libxendevicemodel ABI? No, but I would appreciate if such things were explicitly considered on a case by case by case basis rather than just bundled under a generic "it's not possible yet", since there may be cases where we want to hold off, or more likely where doing something a particular way now will ease things for the transition in the future. > Also this particular > change regards PCI passthrough, which is not convered by the proposed > ABI yet. >=20 >=20 > > Maybe that library could contain a way to get this information? (In > > which > > case it could be hardcoded at compile time now and I'll see what I can > > do > > when I get to producing the library). >=20 > Given the choice, I would rather have only compile time or only run time > Xen version checks in QEMU and not both to avoid complexity. Especially > as long as the underlying libraries don't make any stability guarantees. "that library" obviously will make such guarantees as a matter of design. Ian. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: [PATCH RFC v2 4/4] xen/MSI: re-expose masking capability Date: Mon, 14 Dec 2015 11:41:34 +0000 Message-ID: <1450093294.16856.46.camel@citrix.com> References: <56548BD202000078000B881F@prv-mh.provo.novell.com> <56548D8402000078000B8840@prv-mh.provo.novell.com> <5665921202000078000BCA2A@prv-mh.provo.novell.com> <5665B56E02000078000BCB52@prv-mh.provo.novell.com> <566AF76502000078000BEB76@prv-mh.provo.novell.com> <1449852961.30975.71.camel@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1a8RWj-0003rY-1Y for xen-devel@lists.xenproject.org; Mon, 14 Dec 2015 11:42:49 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Stefano Stabellini Cc: xen-devel , qemu-devel@nongnu.org, Jan Beulich List-Id: xen-devel@lists.xenproject.org T24gTW9uLCAyMDE1LTEyLTE0IGF0IDExOjE5ICswMDAwLCBTdGVmYW5vIFN0YWJlbGxpbmkgd3Jv dGU6Cj4gT24gRnJpLCAxMSBEZWMgMjAxNSwgSWFuIENhbXBiZWxsIHdyb3RlOgo+ID4gT24gRnJp LCAyMDE1LTEyLTExIGF0IDE2OjQ0ICswMDAwLCBTdGVmYW5vIFN0YWJlbGxpbmkgd3JvdGU6Cj4g PiA+IMKgCj4gPiA+IEl0IGlzIG5vdCBwb3NzaWJsZSB0byBkbyB0aGlzIGF0IHJ1bnRpbWUuIEkg dGhpbmsgd2Ugc2hvdWxkIGRvIHRoaXMKPiA+ID4gYXQKPiA+ID4gY29tcGlsZSB0aW1lIGJlY2F1 c2UgaW4gYW55IGNhc2UgaXQgaXMgbm90IHN1cHBvcnRlZCB0byBydW4gYSBRRU1VCj4gPiA+IGJ1 aWx0Cj4gPiA+IGZvciBhIGdpdmVuIFhlbiB2ZXJzaW9uIG9uIGEgZGlmZmVyZW50IFhlbiB2ZXJz aW9uLgo+ID4gCj4gPiBJIGFtIGN1cnJlbnRseSB3b3JraW5nIHByZXR0eSBoYXJkIHRvIG1ha2Ug dGhpcyBwb3NzaWJsZSBpbiB0aGUgZnV0dXJlLAo+ID4gaXQKPiA+IHdvdWxkIGJlIGEgc2hhbWUg dG8gYWRkIGFub3RoZXIgcmVhc29uIGl0IHdhc24ndCBwb3NzaWJsZSBhdCB0aGlzCj4gPiBzdGFn ZS4KPiA+IAo+ID4gSSBwcm9wb3NlZCAoaW4gPDE0NDU0NDI0MzUuOTU2My4xODQuY2FtZWxAY2l0 cml4LmNvbT4pIHRoYXQgYXMgd2VsbCBhcwo+ID4gdGhlCj4gPiB2YXJpb3VzIHN0YWJsZSBsaWJy YXJpZXMgZXh0cmFjdGVkIGZyb20gbGlieGVuY3RybCB3ZSB3aWxsIHByb2JhYmx5Cj4gPiBhbHNv Cj4gPiB3YW50IHRvIGhhdmUgYSBsaWJ4ZW5kZXZpY2Vtb2RlbC5zbyBhdCBzb21lIHBvaW50LCB0 byBwcm92aWRlIGEgc3RhYmxlCj4gPiB3YXkKPiA+IHRvIGludGVyZmFjZSB3aXRoIGFsbCB0aGUg c3R1ZmYgd2hpY2ggYmVpbmcgYSBETSBpbnZvbHZlcy4KPiAKPiBJIHVuZGVyc3RhbmQgdGhlIGRp cmVjdGlvbiB3ZSBhcmUgaGVhZGluZyB0b3dhcmQsIGJ1dCB1bmZvcnR1bmF0ZWx5IHdlCj4gYXJl IHN0aWxsIHByZXR0eSBmYXIgZnJvbSBpdC4gSSBkb24ndCB0aGluayB3ZSB3YW50IHRvIGJsb2Nr IHRoaXMgcGF0Y2gKPiB1bnRpbCB3ZSBoYXZlIGEgc3RhYmxlIGxpYnhlbmRldmljZW1vZGVsIEFC ST8KCk5vLCBidXQgSSB3b3VsZCBhcHByZWNpYXRlIGlmIHN1Y2ggdGhpbmdzIHdlcmUgZXhwbGlj aXRseSBjb25zaWRlcmVkIG9uIGEKY2FzZSBieSBjYXNlIGJ5IGNhc2UgYmFzaXMgcmF0aGVyIHRo YW4ganVzdCBidW5kbGVkIHVuZGVyIGEgZ2VuZXJpYyAiaXQncwpub3QgcG9zc2libGUgeWV0Iiwg c2luY2UgdGhlcmUgbWF5IGJlIGNhc2VzIHdoZXJlIHdlIHdhbnQgdG8gaG9sZCBvZmYsIG9yCm1v cmUgbGlrZWx5IHdoZXJlIGRvaW5nIHNvbWV0aGluZyBhIHBhcnRpY3VsYXIgd2F5IG5vdyB3aWxs IGVhc2UgdGhpbmdzIGZvcgp0aGUgdHJhbnNpdGlvbiBpbiB0aGUgZnV0dXJlLgoKPiAgQWxzbyB0 aGlzIHBhcnRpY3VsYXIKPiBjaGFuZ2UgcmVnYXJkcyBQQ0kgcGFzc3Rocm91Z2gsIHdoaWNoIGlz IG5vdCBjb252ZXJlZCBieSB0aGUgcHJvcG9zZWQKPiBBQkkgeWV0Lgo+IAo+IAo+ID4gTWF5YmUg dGhhdCBsaWJyYXJ5IGNvdWxkIGNvbnRhaW4gYSB3YXkgdG8gZ2V0IHRoaXMgaW5mb3JtYXRpb24/ IChJbgo+ID4gd2hpY2gKPiA+IGNhc2UgaXQgY291bGQgYmUgaGFyZGNvZGVkIGF0IGNvbXBpbGUg dGltZSBub3cgYW5kIEknbGwgc2VlIHdoYXQgSSBjYW4KPiA+IGRvCj4gPiB3aGVuIEkgZ2V0IHRv IHByb2R1Y2luZyB0aGUgbGlicmFyeSkuCj4gCj4gR2l2ZW4gdGhlIGNob2ljZSwgSSB3b3VsZCBy YXRoZXIgaGF2ZSBvbmx5IGNvbXBpbGUgdGltZSBvciBvbmx5IHJ1biB0aW1lCj4gWGVuIHZlcnNp b24gY2hlY2tzIGluIFFFTVUgYW5kIG5vdCBib3RoIHRvIGF2b2lkIGNvbXBsZXhpdHkuIEVzcGVj aWFsbHkKPiBhcyBsb25nIGFzIHRoZSB1bmRlcmx5aW5nIGxpYnJhcmllcyBkb24ndCBtYWtlIGFu eSBzdGFiaWxpdHkgZ3VhcmFudGVlcy4KCiJ0aGF0IGxpYnJhcnkiIG9idmlvdXNseSB3aWxsIG1h a2Ugc3VjaCBndWFyYW50ZWVzIGFzIGEgbWF0dGVyIG9mIGRlc2lnbi4KCklhbi4KCl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5n IGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cDovL2xpc3RzLnhlbi5vcmcveGVuLWRl dmVsCg==